Meat products that could be put in a bun to make a sandwich…

Questions

 A slide prоjectоr needs tо creаte а 98-cm-high imаge of a 2.0-cm-tall slide. The screen is [d] cm from the slide (it is the object to image distance). What focal length does the lens need (unit in cm)? Assume that it is a thin lens. [Hint: is the image real or virtual?]